Even though I ordered Zeta from an official US reseller store, the product box I received was in the German language (at least part of it was). I recognized the company name, yellowTAB, and the name of the operating system, Zeta. But all other information printed on the box, including the system requirements, were printed in German.

I hope they mean version 2.0, because I see this as a major change that will affect program compatibility.

I think I remember reading a description of how Haiku could move to GCC 4 and keep backwards compatibility (I don't remember the details, but I believe it involved keeping a copy of the GCC 2.95-compiled system files as well). I would imagine YellowTAB could manage something like that for ZETA.